Tool-rest



t. V.UNITED STATES EPHRAIM ELLIOTT, F LOWELL, MASSACHUSETTS.

SPECIFICATION forming part of Letters REST.

Patent No. 239,945, dated April 12, 1881.

Application filed December 2, 151.80. (No model.)

T 0 alt whom it may concern:

Be it known that I, EPHRAIM ELLIOTT, of Lowell, in the county of Middlesex and State of Massachusetts, have invented anew and useful Tool-Carriage for Lathes, ot' which the following is a specification.

My invention relates to that class of lathes in which the spindle is hollow and adapted to hold and revolve the shaft or rod to be operated upon, and has for its object to provide means for more rapidly and eft'ectually cutting off shafts, rods, or pipes than any heretofore known; and myinvention consists in theA combination and arrangement upon the same lathe carriage of two sliding blocks, each adapted to carry a cutting-off tool, and a rightand-left screw, whereby said blocks may be simultaneously moved along such carriage in opposite directions, so that the two tools may operate at the same time upon opposite sides of the same shaft, as hereinafter set forth.

In the accompanying drawings, in which similar letters indicate similar parts, Figure l is a perspective of a lathe provided with this tool-carriage 5 Fig. 2, an enlarged view of the carriage, showing the tool-posts in section and Fig. 3, an elevation ofthe carriage, showing an alternative device for moving the toolposts upon the carriage.

A, Fig. 1, represents a lathe bed or frame provided with' suitable supports and bearings for the hollow conespindle B,which is adapted to be revolved by any suitable means, and to carry with it in its revolution any shaft or rod G to be operated upon, such shaft being centrally xed in such spindle by a chuck, D, or any othernsuitable means.

E represents the tool-carriage, to which my improvements relate. This is shown as adapted to slide longitudinally upon the lathe-bed in the usual way, being operated by a rack, ci, attached thereto, and a pinion workingtherein operated by a hand-wheel, b,- but any of the usual means may be used.

Upon the carriage E (shown in detail in Fig. 2) are two sliding blocks, FF, adapted to move y along the carriage, and held thereto by the dovetail projection g, with which they each interlock, as shown. A rod, d, provided with a a right and left hand screw-thread on dierent portions of its length respectively, is held in the stud con the carriage E, and passes through the studs p p, attached one to each ofthe sliding blocks F F, each of these studs being provided with a screw-thread to receive the corresponding thread upon the screw-rod d, one being 'a right and the other a left hand thread, as shown.

It will be readily seen that by revolving the screw-rod d (for which purpose a crank-handle, j', is provided) the sliding blocks F F will approach each other or recede, according to the direction in which the screw -rod is turned. The sliding blocks F F are each provided with a tool-post, Gr, interlocking therewith, as shown at c, Fig. 2, and provided with a slot to receive the tool h and the blocks t' i and jj, as shown. Two set-screws, 7c k, in each post are adapted to be screwed down upon the tool d, and thus hold it and the blocks i and j j rmly together and upon the slide F, the interlocking portion of the post G resisting the upward strain of the screws, and thus holding all the parts rigidly in position. The blocks t' and j are of equal thickness with the cutting-tool d, so as to occupy the same slot in the tool-post G, and their adjacent surfaces are curved longitudi nally in the arc of a circle, the one being the counterpart of the other, as is plainly shown in Fig. 2.

By adjusting the screws 7c k the tool d may be inclined to any desired angle with the horizon, the convex surface of the block c' sliding upon the concave surface of the block j while making such adjustment, and when both screws are tightened retaining their position rmly. j Fig. 3 represents an alternative device for feeding the tools d d toward and from each other.

Instead of the screw d, a plate, H, is attached by a stud (about which it is movable) to the F is joined by a link, n, to one of the sides of such plate, so that by partially revolving the plate (for which purpose ahandle, o, is 'provided) the sliding blocks may be made to approach or recede, as indicated by the dotted lines in Fig. 3. For some kinds of work" this device is preferable to the screw d, as it may operate to recede the tools `more rapidly than the screw d.

If desired, the screw d may be disconnected carriage E, and each of the sliding blocks F TOO from the stud e, and then it will operate to simply advance or retract the tools, leaving them independent of the carriage E as regards their horizontal position in the direction of its length. When thus arranged and operating to cut oi1 a shaft the tools will automatically assume such a position that each will bear against the shaft with the same pressure.

In operating the machine the shaft or rod to be cut oft' is placed in the hollow spindle B, projecting beyond the tool h any desired distance, and being fixed centrally therein by a chuck, D, or other suitable means, is revolved with the spindle. The two tools h h being fastened in the toolposts Gr G in such a manner that when their cutting-points are advanced toward each other they will meet in the center of the shaft. The screw d is revolved,

and each tool ents its way into the material until they meet in the center. By thus using two tools on opposite sides any liability of the shaft to spring away from the tool is obviated.

The tools may, if desired, be so set that each v and-left screw d, and the movable tool-posts G Gr, mounted on said sliding blocks and having the cutters h adjustable therein, substantially as shown and described.

EPH RAIM ELLIOTT. Witnesses:

GEO. L. Asnwon'rrr, WiLLIAM ROBINSON. 

